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求解小Knudsen数的Boltzmann方程时,本文改进了Grad展开,得到了没有久期项的初始层解,这个解反映出气体中可能存在高阶矩的声波。In solving Boltzmann equation with a small Knudson number, we improved Grad expansion and got an "initial layer" solution without secular terms. This solution indicates that high-moment sound waves may exist in gases.
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